This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 43 |
| 3 | 358 |
| 4 | 3393 |
| 5 | 36046 |
| 6 | 424051 |
| 7 | 5470158 |
| 8 | 76751233 |
| 9 | 1163391958 |
| 10 | 18941512731 |
| 11 | 329604456886 |
| 12 | 6103575192193 |
| 13 | 119823200043678 |
| 14 | 2485452283923043 |
| 15 | 54309931242376606 |
| 16 | 1246803623807490561 |
| 17 | 29999359707124127398 |
| 18 | 754865494585690965643 |
| 19 | 19824604328577866107398 |